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package main
// #cgo CFLAGS: -I${SRCDIR}/../salticidae/include/
// #include <stdlib.h>
// #include "salticidae/network.h"
// void onTerm(int sig, void *);
// void onReceiveHello(msg_t *, msgnetwork_conn_t *, void *);
// void onReceiveAck(msg_t *, msgnetwork_conn_t *, void *);
// bool connHandler(msgnetwork_conn_t *, bool, void *);
// void errorHandler(SalticidaeCError *, bool, void *);
import "C"
import (
"os"
"fmt"
"unsafe"
"github.com/Determinant/salticidae-go"
)
const (
MSG_OPCODE_HELLO salticidae.Opcode = iota
MSG_OPCODE_ACK
)
func msgHelloSerialize(name string, text string) salticidae.Msg {
serialized := salticidae.NewDataStream()
serialized.PutU32(salticidae.ToLittleEndianU32(uint32(len(name))))
serialized.PutData([]byte(name))
serialized.PutData([]byte(text))
return salticidae.NewMsgMovedFromByteArray(
MSG_OPCODE_HELLO, salticidae.NewByteArrayMovedFromDataStream(serialized))
}
func msgHelloUnserialize(msg salticidae.Msg) (name string, text string) {
p := msg.GetPayloadByMove()
succ := true
length := salticidae.FromLittleEndianU32(p.GetU32(&succ))
t := p.GetDataInPlace(int(length)); name = string(t.Get()); t.Release()
t = p.GetDataInPlace(p.Size()); text = string(t.Get()); t.Release()
return
}
func msgAckSerialize() salticidae.Msg {
return salticidae.NewMsgMovedFromByteArray(MSG_OPCODE_ACK, salticidae.NewByteArray())
}
func checkError(err *salticidae.Error) {
if err.GetCode() != 0 {
fmt.Printf("error during a sync call: %s\n", salticidae.StrError(err.GetCode()))
os.Exit(1)
}
}
type MyNet struct {
net salticidae.MsgNetwork
name string
cname *C.char
}
var (
alice, bob MyNet
ec salticidae.EventContext
)
//export onTerm
func onTerm(_ C.int, _ unsafe.Pointer) {
ec.Stop()
}
//export onReceiveHello
func onReceiveHello(_msg *C.struct_msg_t, _conn *C.struct_msgnetwork_conn_t, userdata unsafe.Pointer) {
msg := salticidae.MsgFromC(salticidae.CMsg(_msg))
conn := salticidae.MsgNetworkConnFromC(salticidae.CMsgNetworkConn(_conn))
net := conn.GetNet()
name, text := msgHelloUnserialize(msg)
myName := C.GoString((*C.char)(userdata))
fmt.Printf("[%s] %s says %s\n", myName, name, text)
ack := msgAckSerialize()
net.SendMsg(ack, conn)
}
//export onReceiveAck
func onReceiveAck(_ *C.struct_msg_t, _conn *C.struct_msgnetwork_conn_t, userdata unsafe.Pointer) {
myName := C.GoString((*C.char)(userdata))
fmt.Printf("[%s] the peer knows\n", myName)
}
//export connHandler
func connHandler(_conn *C.struct_msgnetwork_conn_t, connected C.bool, userdata unsafe.Pointer) C.bool {
conn := salticidae.MsgNetworkConnFromC(salticidae.CMsgNetworkConn(_conn))
net := conn.GetNet()
myName := C.GoString((*C.char)(userdata))
n := alice
if myName == "bob" { n = bob }
if connected {
if conn.GetMode() == salticidae.CONN_MODE_ACTIVE {
fmt.Printf("[%s] connected, sending hello.\n", myName)
hello := msgHelloSerialize(myName, "Hello there!")
n.net.SendMsg(hello, conn)
} else {
fmt.Printf("[%s] accepted, waiting for greetings.\n", myName)
}
} else {
fmt.Printf("[%s] disconnected, retrying.\n", myName)
err := salticidae.NewError()
net.Connect(conn.GetAddr(), false, &err)
}
return true
}
//export errorHandler
func errorHandler(_err *C.struct_SalticidaeCError, fatal C.bool, _ unsafe.Pointer) {
err := (*salticidae.Error)(unsafe.Pointer(_err))
s := "recoverable"
if fatal { s = "fatal" }
fmt.Printf("Captured %s error during an async call: %s\n", s, salticidae.StrError(err.GetCode()))
}
func genMyNet(ec salticidae.EventContext,
name string,
myAddr salticidae.NetAddr, otherAddr salticidae.NetAddr) MyNet {
err := salticidae.NewError()
netconfig := salticidae.NewMsgNetworkConfig()
net := salticidae.NewMsgNetwork(ec, netconfig, &err); checkError(&err)
n := MyNet { net: net, name: name, cname: C.CString(name) }
cname := unsafe.Pointer(n.cname)
n.net.RegHandler(MSG_OPCODE_HELLO, salticidae.MsgNetworkMsgCallback(C.onReceiveHello), cname)
n.net.RegHandler(MSG_OPCODE_ACK, salticidae.MsgNetworkMsgCallback(C.onReceiveAck), cname)
n.net.RegConnHandler(salticidae.MsgNetworkConnCallback(C.connHandler), cname)
n.net.RegErrorHandler(salticidae.MsgNetworkErrorCallback(C.errorHandler), cname)
n.net.Start()
n.net.Listen(myAddr, &err); checkError(&err)
n.net.Connect(otherAddr, false, &err); checkError(&err)
return n
}
func main() {
ec = salticidae.NewEventContext()
err := salticidae.NewError()
aliceAddr := salticidae.NewAddrFromIPPortString("127.0.0.1:12345", &err)
bobAddr := salticidae.NewAddrFromIPPortString("127.0.0.1:12346", &err)
alice = genMyNet(ec, "alice", aliceAddr, bobAddr)
bob = genMyNet(ec, "bob", bobAddr, aliceAddr)
ev_int := salticidae.NewSigEvent(ec, salticidae.SigEventCallback(C.onTerm), nil)
ev_int.Add(salticidae.SIGINT)
ev_term := salticidae.NewSigEvent(ec, salticidae.SigEventCallback(C.onTerm), nil)
ev_term.Add(salticidae.SIGTERM)
ec.Dispatch()
alice.net.Stop()
bob.net.Stop()
C.free(unsafe.Pointer(alice.cname))
C.free(unsafe.Pointer(bob.cname))
}
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